Analog Heat Round Fuzz: Why So Unpredictable?

I know the Round Fuzz circuit has been addressed before, but I’m curious if anyone knows more about it.

In the manual it is described as “interesting and often unpredictable.” Why?

I was messing around with Heat today. Round Fuzz definitely seemed wild. I’m also curious to see the responses.

Me too. Seriously, nobody?

Hard clipping vs soft clipping. At least in terms of general fuzz distortions.

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it has always sounded to me like an attempt to emulate some of the characteristic distortions of tube circuits, but by using solid state components. it sounds good, and it is interesting and somewhat reminiscent of tube distortion but I would not describe it as unpredictable, especially compared to an actual tube circuit


Because it’s cool

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But it is (as I know) the only circuit that spreads stereo in that way.

Well, the end all answer lol

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Round Fuzz seems to be based on Octavia/Octavio Fuzz pedal type.
It is very similar to the Analog Drive’s Harmonic Fuzz :

HARMONIC FUZZ Octave fuzz with a smooth feel. Based on a fuzz that is out of production. (Which one is a well-kept secret.)

It generates 1 octave up harmonics with single notes. It can sound very dissonant if you play something different than a fifth chord.

Octavio used by Jimi Hendrix in Band of Gypsies.
At 9’30

Even with a mono signal ? I guess it is not intended and some people complained about that.


It’s fuzz, which by design is gnarly


Round Fuzz is a specific Fuzz. Octave Fuzz.
Very easy to recognize with a guitar, neck pickup.

Right. It might be the unpredictable quality of it in true stereo.

Thanks for all the resource sharing!